ETSI TS 103 738 V1.3.1 (2018-10)

Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband wireless terminals (handsfree) from a QoS perspective as perceived by the user

RTS/STQ-272-2

General Information

• Status: Published
• Publication Date: 17-Oct-2018
• Technical Committee: STQ - Speech and multimedia Transmission Quality
• Current Stage: 12 - Completion
• Due Date: 18-Oct-2018
• Completion Date: 18-Oct-2018

Standards Content (Sample)

ETSI TS 103 738 V1.3.1 (2018-10)






TECHNICAL SPECIFICATION
Speech and multimedia Transmission Quality (STQ);
Transmission requirements for
narrowband wireless terminals (handsfree)
from a QoS perspective as perceived by the user

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2 ETSI TS 103 738 V1.3.1 (2018-10)



Reference
RTS/STQ-272-2
Keywords
speech, terminal
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3 ETSI TS 103 738 V1.3.1 (2018-10)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 7
3 Definitions of terms and abbreviations. 8
3.1 Terms . 8
3.2 Abbreviations . 9
4 Configurations and interfaces . 10
4.0 Introduction . 10
4.1 Access networks . 10
4.2 Additional (radio) links between the terminal and external electroacoustical devices . 10
5 Test Configurations . 10
5.1 Set-up interface . 10
5.2 Set-up for terminals . 11
5.2.0 General . 11
5.2.1 Handheld terminal . 11
5.2.2 Vehicle mounted hands-free . 11
5.2.3 Desktop hands-free terminal . 11
5.2.4 Additional test setup for hands-free function with softphone . 12
5.2.4.0 General . 12
5.2.4.1 Softphone including speakers and microphone . 13
5.2.4.2 Softphone with separate speakers . 14
5.2.5 Test setup for variable echo path . 15
5.3 Acoustical environment . 15
5.4 Test signals . 16
5.5 Calibration and test signal level . 16
5.5.1 Send . 16
5.5.2 Receive . 17
5.5.3 Setup of background noise simulation . 17
5.6 Environmental conditions for tests . 18
5.7 Accuracy of test equipment . 18
5.8 Power feeding conditions . 19
5.9 Influence of terminal delay on measurements . 19
6 Codec independent Requirements and associated Measurement Methodologies . 19
6.1 Send and receive frequency response . 19
6.1.1 Send frequency response . 19
6.1.2 Receive frequency response . 20
6.1.2.1 Handheld terminal . 20
6.1.2.2 Void. 22
6.1.2.3 Softphone (computer-based terminals) . 22
6.1.2.4 Desktop Terminal . 22
6.2 Send and receive loudness ratings . 23
6.2.1 Send Loudness Ratings . 23
6.2.2 Microphone (Mic) mute . 23
6.2.3 Receive Loudness Ratings . 23
6.3 Send and receive noise . 24
6.3.1 Send Noise . 24
6.3.2 Receive Noise . 25
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4 ETSI TS 103 738 V1.3.1 (2018-10)
6.4 Send and receive distortion . 26
6.4.0 General . 26
6.4.1 Send distortion . 26
6.4.2 Receive distortion . 26
6.5 Terminal Coupling Loss weighted (TCLw) . 27
6.6 Stability Loss (or similar parameters) . 27
6.7 Double talk performance . 28
6.7.0 General . 28
6.7.1 Attenuation Range in Send Direction during Double Talk A . 28
H,S,dt
6.7.2 Attenuation Range in Receive Direction during Double Talk A . 29
H,R,dt
6.7.3 Detection of echo components during double Talk . 30
6.7.4 Minimum activation level and sensitivity of double talk detection . 31
6.8 Switching parameters . 32
6.8.0 Introduction. 32
6.8.1 Activation in Send Direction . 32
6.8.2 Minimum activation level and sensitivity in Receive direction . 32
6.8.3 Automatic level control . 33
6.8.4 Silence Suppression and Comfort Noise Generation . 33
6.9 Background noise performance . 33
6.9.1 Performance in send direction in the presence of background noise . 33
6.9.2 Speech Quality in the Presence of Background Noise . 34
6.9.3 Quality of Background Noise Transmission (with Far End Speech) . 35
6.10 Quality of echo cancellation . 35
6.10.1 Temporal echo effects . 35
6.10.2 Spectral Echo Attenuation . 36
6.10.3 Occurrence of Artefacts . 36
6.10.4 Variable echo path . 37
6.11 Send and receive delay or round trip delay . 37
6.12 Void . 39
7 Codec dependent requirements and associated Measurement Methodologies . 39
7.1 Speech Coders . 39
7.2 Void. . 39
7.3 Objective listening speech quality . 39
7.3.0 Introduction. 39
7.3.1 Objective listening speech quality MOS-LQO in send direction . 40
7.3.2 Objective listening quality MOS-LQO in receive direction . 40
7.3.2.1 Jitter- and Error-Free Condition . 40
7.3.2.2 Packet Impairments . 41
Annex A (informative): Bibliography . 44
History . 45

ETSI

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5 ETSI TS 103 738 V1.3.1 (2018-10)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Speech and multimedia
Transmission Quality (STQ).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The present document covers wireless speech terminals. It aims to enhance the interoperability and end-to-end quality
with all other types of terminals.
The advanced signal processing of terminals is targeted to speech signals. Therefore, wherever possible speech signals
are used for testing in order to achieve mostly realistic test conditions and meaningful results.

ETSI

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6 ETSI TS 103 738 V1.3.1 (2018-10)
1 Scope
The present document provides speech transmission performance requirements for wireless terminals; it addresses all
types of wireless terminals, including softphones. This part addresses handsfree function of narrowband wireless
terminals.
In contrast to other standards which define minimum performance requirements it is the intention of the present
document to specify terminal equipment requirements which enable manufacturers and service providers to enable good
quality end-to-end speech performance as perceived by the user, whatever be the radio link (terminals may implement
different radio links with the access network).
®
When an additional radio link between the terminal and external electroacoustical devices is used (e.g. Bluetooth link),
the standard will address the overall quality.
In the present document, objective measurement methodologies and requirements for wireless speech terminals are
given.
In addition to basic testing procedures, the present document describes advanced testing procedures taking into account
further quality parameters as perceived by the user.
The requirements available in the present document will ensure a high compatibility across access networks with all
types of terminals.
It is the aim to optimize the listening and talking quality, conversational performance, as well as the use in noisy
environment. Related requirements and test methods will be defined in the present document.
For all the functions, the standard will consider the limitations in audio performance due to different form factors
(e.g. size, shape).
Terminals which are not intended to be connected to public networks are outside the scope of the present document.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 126 171 (V6.0.0): "Digital cellular telecommunications system (Phase 2+); Universal
Mobile Telecommunications System (UMTS); AMR speech codec, wideband; General description
(3GPP TS 26.171 version 6.0.0 Release 6)".
[2] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in
international connections".
[3] Void.
[4] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".
[5] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code
Modulation (ADPCM)".
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7 ETSI TS 103 738 V1.3.1 (2018-10)
[6] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure
algebraic-code-excited linear prediction (CS-ACELP)".
[7] Recommendation ITU-T G.729.1: "G.729 based embedded variable bit-rate coder: An 8-32 kbit/s
scalable wideband coder bitstream interoperable with G.729".
[8] Void.
[9] Recommendation ITU-T P.56: "Objective measurement of active speech level".
[10] Recommendation ITU-T P.58: "Head and torso simulator for telephonometry".
[11] Recommendation ITU-T P.79: "Calculation of loudness ratings for telephone sets".
[12] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[13] Recommendation ITU-T P.342: "Transmission characteristics for narrow-band digital
loudspeaking and hands-free telephony terminals".
[14] Recommendation ITU-T P.501: "Test signals for use in telephonometry".
[15] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using
complex test signals".
[16] Recommendation ITU-T P.581: "Use of head and torso simulator (HATS) for hands-free terminal
testing".
[17] Recommendation ITU-T O.41: "Psophometer for use on telephone-type circuits".
[18] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters -
Part 1: Specifications".
[19] ETSI TS 146 010: "Digital cellular telecommunications system (Phase 2+); Full-rate speech;
Transcoding (3GPP TS 46.010 Release 9)".
[20] ETSI TS 146 060: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate
(EFR) speech transcoding (3GPP TS 46.060 Release 9)".
[21] ETSI TS 103 106 (03-2013) (V1.2.1): "Speech and multimedia Transmission Quality (STQ);
Speech quality performance in the presence of background noise: Background noise transmission
for mobile terminals-objective test methods".
[22] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".
[23] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".
[24] ETSI TS 126 441 (V12.0.0): "Universal Mobile Telecommunications System (UMTS); LTE; EVS
Codec General Overview (3GPP TS 26.441 version 12.0.0 Release 12)".
[25] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field
reproduction method for terminal testing including a background noise database".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
ETSI

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8 ETSI TS 103 738 V1.3.1 (2018-10)
[i.1] Void.
[i.2] Recommendation ITU-T P.1100: "Narrowband hands-free communication in motor vehicles".
[i.3] IEC 61672 (Edition 1.0): "Electroacoustics - Sound level meters".
[i.4] Void.
[i.5] Void.
[i.6] ETSI EG 201 377-1: "Speech and multimedia Transmission Quality (STQ); Specification and
measurement of speech transmission quality; Part 1: Introduction to objective comparison
measurement methods for one-way speech quality across networks".
[i.7] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals
and gateways".
3 Definitions of terms and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
artificial ear: device for the calibration of earphones incorporating an acoustic coupler and a calibrated microphone for
the measurement of the sound pressure and having an overall acoustic impedance similar to that of the median adult
human ear over a given frequency band
codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions
of transmission in the same equipment
ear-Drum Reference Point (DRP): point located at the end of the ear canal, corresponding to the ear-drum position
freefield equalization: artificial head equalized flat for frontal sound incidence in anechoic conditions
group audio terminal: handsfree telephony terminal primarily designed for use by several users which will not be
equipped with a handset.
handsfree telephony terminal: telephony terminal using a loudspeaker associated with an amplifier as a telephone
receiver and which can be used without a handset
HATS Hands-Free Reference Point (HATS HFRP): reference point "n" from Recommendation ITU-T P.58 [10]: "n"
is one of the points numbered from 11 to 17 and defined in table 6a of Recommendation ITU-T P.58 [10] (coordinates
of far field front point)
NOTE: The HATS HFRP depends on the location(s) of the microphones of the terminal under test: the
appropriate axis lip-ring/HATS HFRP is to be as close as possible to the axis lip-ring/HFT microphone
under test.
Head And Torso Simulator (HATS) for telephonometry: manikin extending downward from the top of the head to
the waist, designed to simulate the sound pick-up characteristics and the acoustic diffraction produced by a median
human adult and to reproduce the acoustic field generated by the human mouth
loudspeaking function: function of a handset telephone using an external loudspeaker associated with an amplifier as a
telephone receiver
Mouth Reference Point (MRP): point located on axis and 25 mm in front of the lip plane of a mouth simulator
nominal setting of the volume control: volume control setting which yields the RLR value closest to the nominal RLR
NOTE: If no user operable volume control is available, this should be noted in the test report.
softphone: speech communication system based upon a computer
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9 ETSI TS 103 738 V1.3.1 (2018-10)
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
a.c. alternative current
A attenuation range in send direction during double talk
H,S,dt
AM-FM Amplitude Modulation Frequency Modulation
AMR Adaptive Multi-Rate codec
CDMA Code Division Multiple Access
CS Composite Source
CSS Composite Source Signal
DECT Digital Enhanced Cordless Telecommunications
DFT Discrete Fourrier Transform
DRP Drum Reference Point
DUT Device Under Test
EC Echo Cancellation
EFR Enhanced Full Rate
EL Echo loss
EVS-NB Enhanced Voice Services - Narrowband
FFT Fast Fourier Transform
G-MOS-LQOn Overall transmission quality narrowband
GSM Global System for Mobile communication
HATS Head And Torso Simulator
HF Handsfree
HFRP Handsfree Reference Point
HFT Handsfree Telephone
IEC International Electrotechnical Commission
ITU-T International Telecommunication Union - Telecommunication standardization sector
LE Earcap Leakage/Coupling Loss
LQO Listening Quality Objective
LTE Long Term Evolution (3GPP)
MOS Mean Opinion Score
MRP Mouth Reference Point
NB Narrow Band
NLP No
...